/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.plc4x.java.utils.pcap.netty.handlers;

import org.pcap4j.packet.*;

/**
 * Little helper to automatically unwrap TCP packets to only
 * pass along the payload and not the raw Ethernet packet.
 */
public class TcpIpPacketHandler implements PacketHandler {

    @Override
    public byte[] getData(Packet packet) {
        EthernetPacket ethernetPacket = (EthernetPacket) packet;
        IpV4Packet ipv4Packet = (IpV4Packet) ethernetPacket.getPayload();
        TcpPacket tcpPacket = (TcpPacket) ipv4Packet.getPayload();
        if(tcpPacket.getPayload() instanceof UnknownPacket) {
            UnknownPacket unknownPacket = (UnknownPacket) tcpPacket.getPayload();
            return unknownPacket.getRawData();
        }
        return new byte[0];
    }

}
